Brief introductionBT APU Drill Chuck,CNC Drill Chuck Holder, Application range: clip diameter: 0.5-16mm bit .Mechanical spindle and cutting tools and other accessories.High Precision BT shank Tool Holder ,balanced G6.3 or G2.5 For choose.BT Tool Holders for mechanical spindle and cutting tool and other accessory tool connection. Is a simple, popular spindle shank connection standard, mainly BT30 BT40 BT50... Etc.. Mold industry, and high-speed engraving machine, used more.   Specification:1. material:20CrMnTi2. hardness:56±2HRC 3. taper tolerance less than AT3 4. carbon depth >0.8 5. High precision shank connection 6. integratded design of the rob and chuck can avoid the rob and chuck seprate,enchance reliability and stability Products advantages@ integrated design of the rob and collet,can avoid the collet and rob separate@ High accuracy,strong grasp force,and high stability@ Easy broken parts are dealt by quenching@ Self-tightening,grasp the collet slightly,when drilling,graso force is enhancing with the torque increasing and develop obvious strong grasp force to prevent the drill remove